Dang. Guess I will keep as a spare.
Good idea.
With 25 towmaster st tire complaints on NHTSA.gov complaints website and all types of trailering forums around the net they have a poor service record.
My current '97 trailer came OEM with the old style 225/75-15 D Carlisle ST radials. Dumped them on CL and went with 16" LT E tires. I kept the OEM Carlisle as a spare till a few years ago when large sidewall and tread cracks made it unusable. The tire had never been on the ground and still had new tire tits all around.
They make good spares if you have quality tires on the ground.